/Engine/Source/Runtime/RenderCore/Public/ShaderPipelineCache.h
Delegate signature for being notified that all currently viable PSOs have been precompiled from the cache, how many that was and how long spent precompiling (in sec.)
typedef TMulticastDelegate_ThreeParams< void, uint32, double, const [FShaderCachePrecompileContext](API\Runtime\RenderCore\FShaderPipelineCache\FShaderCachePrecompileContext) & > FShaderPrecompilationCompleteDelegate